@inproceedings{karsten1977the,
title={The rational homotopy theory of certain path spaces with applications to geodesics},
author={Karsten Grove, Stephen Halperin, and Micheline Vigué-Poirrier},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203246168785239},
booktitle={Acta Mathematica},
volume={140},
number={1},
pages={277-303},
year={1977},
}
Karsten Grove, Stephen Halperin, and Micheline Vigué-Poirrier. The rational homotopy theory of certain path spaces with applications to geodesics. 1977. Vol. 140. In Acta Mathematica. pp.277-303. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203246168785239.